Sofa



FIG. 1 is a front perspective view of a sofa, showing our my design;

FIG. 2 is front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a side view thereof, the opposite side being a mirror image thereof; and,

FIG. 5 is a rear view thereof. 

CLAIM I claim, the ornamental design for a sofa, as shown and described. 